I make it a plan every October to watch some shows in the spirit of Halloween though, past contenders include:

Higurashi (my favorite anime)
Elfen Lied (Warning, tons of nudity and gore)
C-cubed/C3 (A little on the lewd side, but gory enough to make up for it)
xxxHolic (Not scary or anything, just fits the mood somehow)
Dreameater Merry (Again, not a horror, just fits the mood)

As for shows on CR, idk, maybe Pandora Hearts... Actually, I love Pandora Hearts, so yeah, I would watch that one...